FAQ

One of the reasons of this error can be the fact that one of your customers (or more) are using dedicated IP for his account which is not listed among your license(s). You need to add such IP(s) to the license as well or move such customers to a shared hosting IP.

When using "Custom (API)" method:
If you use API in order to open website builder then this error is usually caused by the fact that the license cannot be detected by parameters of API call. The license is searched by 3 different IPs in specified order:

• by FTP host parameter "apiUrl" which you pass among parameters list in API call (only if the parameter "apiUrl" has format of IP address and not of a domain);
• by IP address of parameter "domain" which you pass among parameters list in API call (if it is resolved).
• by outgoing (external) IP address of server which calls website builder API;

If at least one of these cases match IP(s) in your Site.pro license(s) then the license is considered validated and API returns a valid URL to website builder. Otherwise the error "License is required" is thrown.
So to fix this issue just make sure that during API call in your case the IP of one of specified 3 cases matches IP(s) in your license.

For On-Premises brand only:
Go to Site.pro licenses page, open On-Premises brand and click "Apply" button. If this action results in error then it means that license synchronization fails and cannot be synchronized with your website builder. If error message do not help to fix this issue by yourself then create ticket in support system and describe this problem.